Help needed to calculate the resistance of a ship's hull

vmak · April 27, 2012, 07:28

Dear all,
This is my first post in this forum though I have been following it for some time

I have a hull surface in .igs format and want to calculate resistance of the hull for a speed of 20 knots. If anyone done similar project using cfx, kindly help me in this regard, as I am unable to find any tutorial specific for ship resistance ( or total drag force)

vmak..

mshf7 · May 7, 2013, 10:39

hi dear vmak
I have got a project as like as you and I have got only cfx toturial to help me.If you have any question i will help u if i can

acasas · May 12, 2013, 17:42

Hi guys.

I have also the same questions. In my case for a boat at 40 knots. Where to find a tutorial about this? Is it CFX capable to do it? Maybe Aqwa should be used?

something like this would be nice
http://www.youtube.com/watch?v=AXjTUaqxjPM
and something like this, GREAT !

http://www.youtube.com/watch?v=stSxJ4qsSWI

Thank´s

ghorrocks · May 12, 2013, 19:15

Sure, CFX can do those simulations - but do not underestimate the difficulty of it. I hope you have a supercomputer available to run it. Or are you expecting to run it on your desktop

CFX has strengths in resistance of things like yachts where the turb transition model comes in handy. But if you are talking about vessels like power boats then I do not think CFX is the best choice of code. It can do it but it is difficult to get working right and slow. You might find Fluent faster, and I suspect other software is available specifically designed for these sort of calulations.

For instance Gerris has an impressive list of naval simulations in its examples: http://gfs.sourceforge.net/wiki/index.php/Main_Page

But it does not have a turbulence model so can really only model wave resistance in your application.

April 27, 2012, 07:28	Help needed to calculate the resistance of a ship's hull	#1
vmak New Member vinayak m a k Join Date: Apr 2012 Posts: 1 Rep Power: 0	Dear all, This is my first post in this forum though I have been following it for some time I have a hull surface in .igs format and want to calculate resistance of the hull for a speed of 20 knots. If anyone done similar project using cfx, kindly help me in this regard, as I am unable to find any tutorial specific for ship resistance ( or total drag force) vmak..

May 7, 2013, 10:39	cfx	#2
mshf7 New Member mohammad Join Date: May 2013 Posts: 10 Rep Power: 12	hi dear vmak I have got a project as like as you and I have got only cfx toturial to help me.If you have any question i will help u if i can

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May 12, 2013, 17:42		#3
acasas Member Antonio Casas Join Date: May 2013 Location: world Posts: 85 Rep Power: 12	Hi guys. I have also the same questions. In my case for a boat at 40 knots. Where to find a tutorial about this? Is it CFX capable to do it? Maybe Aqwa should be used? something like this would be nice http://www.youtube.com/watch?v=AXjTUaqxjPM and something like this, GREAT ! http://www.youtube.com/watch?v=stSxJ4qsSWI Thank´s

May 12, 2013, 19:15		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	Sure, CFX can do those simulations - but do not underestimate the difficulty of it. I hope you have a supercomputer available to run it. Or are you expecting to run it on your desktop CFX has strengths in resistance of things like yachts where the turb transition model comes in handy. But if you are talking about vessels like power boats then I do not think CFX is the best choice of code. It can do it but it is difficult to get working right and slow. You might find Fluent faster, and I suspect other software is available specifically designed for these sort of calulations. For instance Gerris has an impressive list of naval simulations in its examples: http://gfs.sourceforge.net/wiki/index.php/Main_Page But it does not have a turbulence model so can really only model wave resistance in your application.